Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Net operating loss carryforwards	$ 12,285	$ 12,218
Allowance for doubtful accounts	262	212
Inventory valuation reserves	1,109	1,185
Equity compensation	4,216	1,769
Intangible assets and goodwill	13,061	15,228
Foreign tax credit carryforwards	0	841
Other	2	32
Total gross deferred tax assets	30,935	31,485
Valuation allowance	(835)	(19,460)
Total deferred tax assets, net	30,100	12,025
Deferred tax liabilities:
Property and equipment	(8,227)	(5,327)
Convertible debt	(4,785)	(8,559)
Prepaid insurance and other	(520)	(78)
Total gross deferred tax liabilities	(13,532)	(13,964)
Net deferred tax assets (liabilities)	16,568
Net deferred tax assets (liabilities)		$ (1,939)